<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <title>4.关于对象的key</title>
  </head>
  <body>
    <script type="text/javascript" >
      let obj = {
        a:1,
        'b-c'(){}
      }

    </script>
  </body>
</html>